White light plz help

I have a 500mhz indigo imac when i press the power button it blinks a white light once and doesn't turn on i opened it up thinking maybe the button was stuck making it stay in sleep mode but it's not plz help me thanks.

No chime can be a symptom of a flat logic board battery.
Perhaps the RAM is bad, but that's unlikely if the machine worked before. Try reseating RAM or removing everything but the stock RAM.
If it's not that, then go here and download the appropriate manual for your iMac, and follow the troubleshotting steps:
http://www.whoopis.com/computer_repair/
Opening the Mac can potentially expose you to up to 26kV of voltage. Make sure you know what you are doing before attempting DIY repair on an iMac or any CRT.

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